Arizona this week was forced to place two starters, cornerback Eric Green (groin) and Pro Bowl strong safety Adrian Wilson (heel/Achilles), on injured reserve for the balance of the season. Aaron Francisco, who began the year as the No. 3 safety, is also sidelined by a calf injury and likely will miss at least another week.
Jue, 28, has played every secondary position, including as a nickel defender, and should be able to provide some relatively quick relief and flexibility to the Cardinals' defense.
A native of Liberia and a former Penn State standout, Jue has appeared in 78 games and has 154 tackles, 1½ sacks, six interceptions, 26 passes defensed, and two forced fumbles. He was a third-round choice of Green Bay in the 2001 draft and played four seasons with the Packers before signing with San Diego as a free agent in 2005.
Used some at cornerback when he first entered the league, Jue made the move to safety as a rookie and has extensive experience at both safety positions. Jue has good ball instincts, is a solid if not physical tackler, and can also play on special teams.
Jue suffered a knee injury early last season that required arthroscopic surgery, came back to play into November, but then finished the season on injured reserve. Although he went to camp with the Chargers, he was released before the start of the season.
He signed with St. Louis last month, when the Rams went through a rash of injuries, and appeared in one game. Jue was then released when some of the St. Louis players recovered from their injuries.
Contract details were not immediately available.
Senior writer Len Pasquarelli covers the NFL for ESPN.com.